Description: This mapping effort was part of a larger project within the Off Highway Motor Vehicle Division of State Parks to create updated vegetation maps and an inventory of native plant communities for each SVRA. When mapping began in 2021, Carnegie SVRA and the adjacent Alameda-Tesla Area were sampled and analyzed together. However, because of the legal the separation of these two units in 2021, they have been separated into two mapping projects. Field sampling was conducted in the SVRA and in the Alameda-Tesla area by State Parks staff on May 3rd-6th, 2021. A total of 16 formal samples were collected, as well as many informal photo points. Vegetation types were assigned using the membership rules of the MCV (CNPS 2022) and by consulting with CDFW staff. A draft map was developed in Fall 2021, drawn by heads-up digitizing and using NAIP 2020 imagery. Mapping followed VegCAMP standards defined in the “Survey of California Vegetation Classification and Mapping Standards” document (CDFW 2020). The minimum mapping unit was 1 acre for upland vegetation types and ¼ acre for wetland vegetation types. Polygons were divided based on a change in cover class according to Braun-Blanquet categories (<1%, 1-5%, >5-15%, >15-25%, >25-50%, >50-75%, >75%). Breaks for the dominant overstory vegetation required a 3-acre minimum mapping unit, and breaks for understory vegetation required a 5-acre minimum mapping unit. An accuracy assessment of the map was conducted on March 17, 2022 by confirming the mapped type for >80% of the polygons in the field. Attribute Fields:OBJECTIDUnique value for each polygonConifCoverAbsolute cover of conifer tree species within the polygon. Attributed in 1% incrementsHdwdCoverAbsolute cover of hardwood tree species within the polygon. Attributed in 1% incrementsTreeCoverAbsolute cover of trees within the polygon. May be less than the sum of conifer + hardwood if there is overlap. Attributed in 1% incrementsShrubCoverAbsolute cover of shrubs within the polygon, attributed in 1% increments. If the overstory tree cover is greater than 40%, shrubs would not be visible in aerial imagery and are not estimated.HerbCoverAbsolute cover of herbaceous vegetation in the polygon. May not be interpretable if shrub or tree cover is high. Cover values for herbaceous vegetation are recorded in the following cover classes: <2%, 2-9%, 10-40%, >40%RoadednessThe cover of roads and trails in the polygon. Categories are: None visible; Low (at least 2/3 of the polygon without any roads); Moderate (1/3 to 2/3 of the polygon without any roads); High (Less than 1/3 of the polygon without any roads); Not Applicable/Not evaluatedMethodIDAttribution method: either the polygon was attributed through image interpretation, based on a field survey, or based on a less-formal field reconnaissanceNotesInformation, caveats, site history etc. NVCS_NameThe mapping class name per NVCS. See vegetation.cnps.org to look up descriptions.NVCS_LevelThe NVCS hierarchy level of the NVCS_Name, e.g., Association, Alliance, Group, Macrogroup, etcGlobalRankThe global rarity ranking for the vegetation alliance, from 1 (very rare and threatened) to 5 (demonstrably secure)StateRankThe California state rarity ranking for the vegetation alliance, from 1 (very rare and threatened) to 5 (demonstrably secure). Natural communities with ranks of S1-S3 are considered Sensitive Natural Communities to be addressed in the environmental review processes of CEQA and its equivalents. More information on the VegCAMP website. NVCSAllianceThe alliance name per NVCS. Will be null for polygons that are mapped at a higher level than alliance (group or macrogroup), or for non-vegetated polygons such as urban, developed, water etc.NVCSGroupThe group name per NVCS. Will be null for polygons that are mapped at a higher level than group (macrogroup), or for non-vegetated polygons such as urban, developed, water etc. NVCSMGThe macrogroup name per NVCS. Will be null for non-vegetated polygons such as urban, developed, water etcMappingUnitNameA common name label developed specifically for this projectField_Verified"Yes" for polygons that have been verified in the field in sampling or during the accuracy assessmentAcresArea in acres of the polygon
Copyright Text: California State Parks. Contact: Melissa Patten Melissa.Patten@parks.ca.gov or Clint Elsholz Clint.Elsholz@parks.ca.gov
Roadedness (type: esriFieldTypeInteger, alias: Roadedness, SQL Type: sqlTypeOther, nullable: true, editable: true, Coded Values: [0: none visible], [1: Low: at least 2/3 of poly without any roads], [2: Moderate: 1/3-2/3 of poly without any roads], ... 2 more ...)